Thanks for the answers and insights!!
1) I hadn't considered the possibility of an airlock situation. Another good reason
to avoid creating a pocket of gas in the test section during filling.
Especially since the profile is very jagged
with lots of little peaks on the way up the hill and...
Hey All,
We need to Hydrotest a pipeline that has some large elevation changes. ( approx. 1500 ft)
The pipe line will be in nitrogen when we begin to fill it with water for the Hydrotest.
Our current plan is to maintain a nitrogen backpressure on the filling pigs so the line does not go slack...
Here is the rest of the story.
We had to an HDD to reroute an existing line.
Our HDD Spec requires the pipe wall to be .5" wt.
The only pipe I could find in time that met our spec was X-52.
Still don't see in B31.4 where there is a limit to the difference in wall thickness.
I Have heard...
Thanks Guys.
This question would be for a crude pipeline.
When I read B31.4-2009 page 45 and 46 it indicates the need to taper the thicker material but it doesn't indicate any maximum allowable difference between wall thickness.
in fact the illustration seems to show that the wall thickness...
Can someone either point me to a resource or explain clearly when transition pieces are required between pipes of either different grade or wt?
1) Say I wanted to join an 8" Pipe .188 wt X-52 to 8" .500 wt X-52. Would I need a transition spool?
2) How about 8" .250 wt Grade B to 8" .500"...
As part of our gathering system we have centrifugal pumps that feed oil down a 4 mile line to a storage Tank. From the tank we have a PD pumps that move the oil farther down the system.
Due to the high cost of tank maintenance/inspection we are discussing tightlining around the tank.
I am...
